From a post in another thread:
DTH dual tip decibel data
Yesterday I recorded DTH dual tip decibel levels at various speeds in my 2008 passion. Windows up, one passenger, level highway, wind dead calm. Insulation: Lowes 3/8" on trunk floor and tailgate compartment. Radio Shack Decibel Sound Level Meter #33-2055 ($49).
Normal conversation--60 db
AVG city traffic noise 80 db
motorcycle (25') 88 db
lawnmotor 85-90 db
Sustained steady speed (accelerating will be much louder)
IDLE--warmed up, stationary, in Park--82 db
40 mph, 5th gear--91 db
50 mph 90 db
60 mph 92 db
70 mph 94 db
80 mph 96 db
Prior to in stalling Dynamat Extreme, I will strip the Lowes, and record db levels. After install Dynamat, I will record db levels and post both "no inulation" and Dynamat data in this thread.
Hope this helps.
Last edited by louis bolieu; 03-13-2009 at 11:19 AM..
Looking at this post , if a Radio Shack meter at $ 49 actually works with decent accuracy (I thought they'd be hundreds of $), my earlier suggestion makes no sense. It'd be simpler just to buy one for a meet. The results would be much more standardized and thereby more comparable.